The air explosion experiments were carried out to investigate the effects of content and size of titanium hydride(TiH₂) on properties of RDX-based TiH₂ composite explosive.Meanwhile, the solid explosion products were analyzed.Results show that the explosion properties of composite explosive are improved with decreasing of TiH₂ size.Compared to standard RDX, the peak overpressure, positive duration and positive impulse of composite explosive with TiH₂ content of 20% and size of 0.96 μm increase 3.8%, 12.7% and 14.0%, respectively.As the content of 0.96 μm TiH₂ increasing from 10% to 20%, the explosion positive impulse increases 7.0% and the peak overpressure decreases 5.1%.Variance analysis indicates that titanium hydride size has a significant impact on properties of composite explosive, and there was an interaction between titanium hydride content and size.Analysis of solid explosion products reveales that the TiH₂ is oxidized into TiO₂ during explosion of composite explosive.